Telephone receiver



A. Pu-u. v

TELEPHONE RECEIVER Dec. 1., '1925-' y f 1,563,787

Filed Qot. 25. 1922 2 Sheets-Sheet l e; Y um@ y i Q ifwwfm Dec; 1 119h25v 1,563,787

, v A. PIHL TELEPHONE RECIVER Filed ont, 25, '1922 Patented Dec. 1, 1925;

vUNrrnD STA rrss PArENr oFFicll.;

maar rmx., or MURRAY, UTAH, .assIGNon rro nommait mimo a mam-incrus- ING COMPANY, A. CORPORATION OF UTAH.

HEISSUEDI TELEPHONE RECEIVER.

Application illed. ctober 25, 1922. Serial Noz 596,729. I

To all 'whom it may comem:g

Be it known that I, ALBERT PIHL, a citizen of .the United States, and resident of Murray, in the county of Salt Lake land State of Utah, have invented certain new and useful Improvements in Telephone Receivers, of which the following isa speciication.

My invention relates to an improved telephon'e receiver adapted `for general use-but particularly for wireless telephony.4 `It is preferably of what is known as the watch case type and is very simple and compact.

in structure. v

` One object of the invention is to provide a n ovel means'for mounting the armature so 'that it will be very. s`ensitive` and require sli ht current to operate.

nothe'robject is to provide a simple coin-- pact: arrangtementof pole pieces Aand 'coils which will 'le 'very efficient.

Otherobjects willbey apparent from the following detailed description and appended, claims. y .In the drawings:

Figure 1 is a face'view of the receiver with the cover 'or cap removed.

Figure 2 is a bottom ceiver removed from t 80 case.' u..

Figure 3 is a sidelevation. i Figure 4 is an elevation taken at right angles to Figure 3. i x

Figure 5 is a view of the main parts of the receiver disassembled.

Fiurc 6 is an cnd'view-of the spool upon whic the coils are Wound.

, Figure 7 isa view at right angles to Figure 6 and partly in section.

Figure 8 shows a' perspective view of an alternative mounting for the armature.

figure 9 is a sectional view of the same showing the armature in position.

Figure 10 is a bottom planlview of an 4:5` alternative form of construction embodying only one coil. l

Figure 11 is a diagrammatic view of the winding of the two coils and their relation to thc armature. A

To a ring 1 of 'suitable material is secured a permanent magnet 2 of the general form shown in Figure 5. Bolts 3 pass through the ring and magnet and are provided with nuts 4 for securing the parts together. rI`wo e usual inclosing lan view of-the re- )ole ieces 5 and 6 are provided with-holes an 8 respectively through which bolts 3. A tuning s ring or-"mem er 9 is provided witha ho e 10 through' which passes one-of the bolts 3. It will be seen therefore that the two bolts 3 Withtheir nuts 4 hold in position` substantially all of the arts of the receiver.

.T 1e s ool '-for the coils is formed of three pieces o fibre 11, 12 and 13 of general elliptical shape having an oblong opening extending therethrough. In the enlarged -edges r of these o enings are 'fitted wooden ypms 14 and 15.

lies along the inner sides vof the wooden pins and is folded upon itself at 18 to overlap the outer ends of the pins, while atjuthe inner' ends, the ends of the stri s are bent over as shown at 19. rhe three ii) i for two coils, one coil 20 lying 'between they strips'll. and 12, and the other coil-21 lyin" between the strips 12 and 13. These coilg arewound inrever'se directions. The. use f a spool of' this type obviates the necessity for insulation, ,and 'produces a light' and cheap construction, .which nevertheless `is very eicient. The pole htstantial y rig t angles to form parts 22 that -extend on the sides ofthe spool. Notcbes 23 arecut out of each p'art 22 and in these engage the wooden ins 14 and 15 when the ass the thin strip of-suitable metal 16 zol brel-stripsprovide iece 6 has 4sides bent at sub#` parts are assemble The pole piece 7 isv similarly formed. The side pieces of the pole piece 6 do not quite contact with the similar arts of the pole piece 7 but spade is left ctwecn them Pieces of mica one of which is shown ingure 5 at 24 lie between the pole pieces" nd the coils.

The armature 25 has projections 26 atf'its sides near themiddle which engage openings or depressions formed-in the 'metal strip 416 nearthe middle of the spool, thuspivoting the armature to move freely. lA pro- 'ection 27 at the inner end ofthe armature 1s connected by a bolt 28 to the diaphragm 29 a nut 30 and to hold the bolt and diaphragm in engagement.

The tuning spring 9 carried at one end by the bolt 3 has a cut out 32 wooden pin 15 and another cut out 33 adjacent the bolt 28, and the inner e'nd of this for theI armature.

washer 31 being employed...

that fits about the.

parts may be included in a suitable case ofl any desired type which will be provided with apertures for the leading in avii'es. The diagrammatic view of Figure 1l shows lioiv the armature which is pivoted on the line a--b is. subjected to thetuning influence of the two coils which are wound iii opposite directions but so `tliatthei'r iiiiueiice is onv the sainev faccof the armature.

` In this mannerthe receiver is rendered more sensitive. vl Figure 10 discloses a modification in vvhich a single coil 37 may be employed instead of the two coils shown in the first form. Otherwise, the two modifications are substantially the same.

'Figures 8 and. 9 :disclose "an alternative manner ofpivoting. the armature. In this form the; central: fibre member 121 .is provided W-itl'ian4 enlarged .central aperture 38. In one fside'so the disc is inserted a metal -membe'r'f39'and asimilar metal piece 40 with a -lip ltiserving gis-engaging means for movement is' slidably mounted in ay passageway" in the disci-"jThe member 39 has lprojections 42 lat'its 'cornersfand the member 40 hassimilar projections 43 at its'corners which come into contacti-withtheiprojections 42 when the i iember- 40 Iis, inserted into position. The -airiiiture 25"*liiis.- notches in its edges into ,ivhiehY it-`tlie' .projections when the member 140 is "pushed Linto Contact with the member BQ'This l'piovidesa freely moving pivotal Support for the armature.

It is obvious that other means may be provided for pivotingithe armature.. Also size,

proportiona'ndform may be-varied 4without j in lany way-departing from the spirit of my invention. ivhieh isto be regarded as limited only1 by the 'scope of the appended claims. I claim asmy invention:

y1. A teleh one'receiver comprising a ring member, -a Ulshaped permanent magnet c'ari'ied by said member, pole pieces 'attached to the ends'oftlie magnet and extending toward each other,=a 'spool retained in position by said pole pieces, two oppositely wound coils on said spool, an opening through the center ofv said spool; an armature pivoted tothe ,spool ivithinsaid opening, a diaphragm carried by the ringv member, and meansw con- 60.' nec-tingl one' lend of the armature to the diaphragm."

2. Aitelephone receiver comprising a ring nieinber,a permanent magnet carried vby said -member and 4having free ends, pole Lpieces attached to the ends of the magnet an having frecgenlds which arc U-shaped, a spool supported between the tree ends of the pole pieces, opp'ositely wound coils on said spool, an opening through the center of the spool, an armature pivoted to the spool in said opening, a diaphragm, and means connecting a spool supported between the free ends of` .the pole pieces, coils o n said spool, anarmature .pivotally supported directly byv said spool, a diaphragm, and means connecting the armature to the diaphragm.

4. A telephone receiver comprising a ring member, a permanent magnet carried therev by, pole pieces'attached to'said magnet and having free ends extending toward each other, a. spool supported betweenthe free -ends of the pole pieces, oppositelyvvound coils on ,saidspooh an armature pivotally supported directly by said spool, a diaphragm, 'and meanspeonnecting the armature to the diaphragm; `2.5. In a telephone-receiver, a spool 'for coils comprising' a* plurality of fibre discs provided withl central openings, vWooden pins ,at .the edges off said openings` and a'metal strip arranged to substantially cover the lends and inside faces of the Wooden' pins.

6,.,In atelephone'receiver, a plurality of fibrediscs 'provided with central openings, w'ooden pins at the edges osaid opening, a c metal strip arranged at the'inner faces of the ,'Woodenpins, and an armature pivotally supported bysaid metal'strip. f

7. In a telephone receiver, a spool for coils comprising fibre Adiscs provided with central openings,` spaced non-metallic membei's. ositioned Within said openings, and a meta strip covering the inner faces of the non-metallic members.

8. In a telephone receiver, a. supporting.

member for an armature comprising a fibre disc having a central opening and notches and relatively adjustable members carried by said disc and projecting linto said opening and provided with projecting corners adapted to engage the notches i-if'the armature.

' 9. A telephone receiver' coin rising a U- shaped permanentmalgnet, po e pieces attached to the ends of th'e'magnet and'extending toward each o ther, a' spool retained in position 'by said pole pieces, oppositely Wound coils on' said spool, an opening ,through the 'center of said spool, an armature pivoted Within said opening so that one coil overlies one part '-offthe armature and the other coil the other part, a'daphragm, andfmeans.Cimectingfone end of the armature to the diaphragm.'

10. A telephone receiver comprising apermaneiitniagnet having separated tree ends,

pole pierres attached to the onds of the mag- :rnd the other coil tha` other part, :r dianet und having free U-Shuped ends, a Spool phrngm. und means Connecting tho armature supported between the free ends of the polo to the diaphragnn.

pieces, oppositcly wound coils on 'said spool, In testimony whereof, I have hereunto 5- an opening through the center of th spool, subscribed my name.

al1-armature ivoted in said opening so that" l one coil oyerlies one pari of the armature ALBERT PHL. 

